Abstract
The effectiveness of a protocol for somatic embryogenesis in conifers requires both the proliferation of embryonal masses and their conversion into somatic plants. Despite several successful protocols developed for Pinaceae, species belonging to Cuperessaceae family are often characterized by a problematic and unsatisfactory maturation of somatic embryos. Hence, the main goal of this study was to overcome the problem of embryo maturation and plant regeneration in Cupressus sempervirens, a Mediterranean species widely used for its ornamental value, timber production and interest in reforestation programmes. Embryogenic lines were produced from selected canker-resistant genotypes of common cypress; the effect of polyethylene glycol (PEG), desiccation period, medium composition and culturing period on the somatic embryo maturation and conversion, were evaluated. Despite significant variations observed among genotypes, the PEG based medium was the most effective for somatic embryo maturation. Germination and conversion of mature somatic embryos took place after three months of culture in a low-sucrose LP medium with activated charcoal. A short desiccation period failed to improve the germination rate of the mature somatic embryos. To our knowledge this is the first protocol reporting on somatic plant regeneration from somatic embryos of C. sempervirens.
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Abbreviations
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- ABA:
-
Abscisic acid
- AC:
-
Activated charcoal
- BA:
-
Benzylaminopurine
- BSA:
-
Bovine serum albumin
- DCR:
-
Gupta and Durzan medium (1985)
- ECL:
-
Embryogenic cell line
- EIM:
-
Embryogenic induction medium
- EM:
-
Embryonal mass
- EMM:
-
Embryogenic post-maturation medium
- GC:
-
Germination and conversion medium
- HRU:
-
High relative humidity
- LP:
-
Quorin and Lepoivre basal salts mixture (1977)
- M-BSA:
-
Maturation medium with BSA
- M-PEG:
-
Maturation medium with PEG
- PEG:
-
Polyethylene glycol
- PGR:
-
Plant growth regulator
- SE:
-
Somatic embryogenesis
- Se:
-
Standard error of the mean
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Acknowledgments
This research was supported by a Grant co-funded by CNR (Research National Council of Italy) and Regione Toscana: REGIONE TOSCANA POR-CRO-FSE “Indagine sulle relazione cipresso-allergie: selezione varietà di cipresso con polline a ridotta allergenicità e con indotta sterilità (CYPALL)”. The authors gratefully thank Dr. Paolo Raddi for his helpful advices and Mr. Vincenzo Di Lonardo for his technical help.
Authors contributions
S.B. designed and made the experiments and data collection, and wrote the first draft of the manuscript; M.L. designed the experiment and gave assistance in performing experiment and data collection; M.L and R.D. critically revised the article for submission; R.D. is the responsible for the genetic improvement programme of cypress and for the financial funding of the project.
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Barberini, S., Danti, R. & Lambardi, M. Somatic plant regeneration from selected common cypress (Cupressus sempervirens L.) clones resistant to the bark canker disease. Plant Cell Tiss Organ Cult 124, 393–403 (2016). https://doi.org/10.1007/s11240-015-0902-4
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DOI: https://doi.org/10.1007/s11240-015-0902-4